The Senate Finance Committee narrowly approved on a party-line vote President Donald Trump's choice to become the new head of the IRS, with the panel's Democrats protesting the nomination because of a new IRS policy allowing some groups to hide their donors' identities.

The Senate is assessing President Donald Trump's choice to head the IRS: Charles Rettig, a Beverly Hills tax lawyer who would face the colossal challenge of overseeing the most sweeping overhaul of the U.S. tax code in three decades.

Taking the first concrete step toward the Republican tax plan's promise of fatter paychecks for millions, the Trump administration on Thursday issued new guidelines for how much employers should withhold as taxes from workers' pay.